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This is Dr. David
no, this not a sign of cancer.
black semen is a sign of old blood getting into the semen.
it is common and often normal to have blood in the semen.
also prostate infection called prostatitis can cause blood in the semen as well.
I am a cancer doctor.
let me know if you have questions.
did you get my response?
thank you for your answer T O Toole
you are welcome.
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